/Engine/Source/Runtime/CoreUObject/Public/UObject/UObjectGlobals.h
NOTE: Prefer using AddPropertyReferences or AddReferencedObjects(const UScriptStruct&) instead, they're much faster.
[FReferenceCollectorArchive](API\Runtime\CoreUObject\UObject\FReferenceCollectorArchive) & GetVerySlowReferenceCollectorArchive()